Improvement in safety-valves



JOHN R. CAZI ER.

Improvement in Safety Valves.

Patented March 19, 1872.

Witnesses:

names JOHN R. GAZIER, OF NORTH EAST, PENNSYLVANIA.

IMPRQVEMENT IN SAFETY-VALVES.

Specification forming part of Letters Patent No. 124,792, dated March 19, 1872.

To all whom it may concern:

Be it known that I, JOHN R. OAZIER, of North East, in the county of Erie and in the State of Pennsylvania, have invented certain new and useful Improvements in Application of Safety-Valves to Steam-Boilers; and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing and to the letters of reference marked thereon makin g a part of this specification.

The nature of my invention consists in the introduction, between the boiler or dome and the valve, of a tube turning downward in a part of its length, so that water condensed from steam generated in the boiler shall apply to the valve, the water thus condensed being interposed between the valve and the steam. The object of this is to keep the safety-valve moist and cool, and thus to prevent it from adhering to the valve-seat. This depends upon the fact that water conducts 'heat but little, if any, so that the lower portion of the water in the tube may be comparatively cool while the upper portion is at the temperature of the steam from which it was condensed.

A represents a cylindrical boiler; B, the

dome; and G, the tube turning downward and bearing the valve-seat at its lower extremity. The valve hinges upon the graduating-lever at D, the fulcrum of which is at E and the poise at F. The valve may be in any form suitable for the purpose. In its practical working the water in the tube must be discharged before the steam can issue, and some kind of a conductor will be required to receive and conduct it away. For a cheap fixture a wooden trough and canvass covering will probably be sufilcient, but a metallic cap and pipe can be supplied, if desired. The valve-tube may be made longer and the valve placed to one side and below the boiler, as shown in Fig. 2, in which the boiler is shown endwise. In Fig. 3 the lower part of the tube has a bend upward, so that the valve G opens upward in the usual way. It is also supplied with a cap and an exhaust-pipe. exhaust-pipe, where it enters the cap, is seen at H. When the tube turns up near the bottom, as in Fig. 3, a stop-cock to discharge water should be supplied, as seen at I. A stop-cock is also desirable, as seen at J in Fig. 2, to cut off the steam when the pipe is to be detached. In the absence of a dome the pipe must be bent over and extend down into the boiler to take its place.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The arrangement of the boiler with the tube 0, between it and the safety-valve, constructed substantially as and for the purposes set forth.

2. In combination with the tube 0, arranged between the boiler and the safety-valve, the stop-cock J, as and for the purposes set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 1st day of March, 1872.

JOHN R. OAZIER. Witnesses:

EnM. F. BROWN, J. M. Mason.

The open end of the. I 

